Re: Model A heads
A photo would help.
Measure the volume of the combustion chamber by turning the head up side down and, with plugs installed, pour water into the combustion chamber. Pour from a measuring cup or beaker so you know how much water goes in. The combustion ratio is the displacement of each cylinder divided by the volume of water. The volume of each cylinder is about 200 cubic inches divided by 4 or 50 cubic inches which converts to 27.7 fluid ounces.
The top of the piston is inside the combustion chamber at TDC, displacing about 4 cubic inches or about 2.2 fluid ounces. Subtract this from the volume of water you measure. So if you measure 7.2 fluid ounces of water, subtract 2.2 to yield 5 fluid ounces to get 27.7/5 or 5.5 to 1. The results are approximate. It is more accurate when measured with the head on the engine. I hope this all makes sense.
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Last edited by nkaminar; 06-13-2025 at 04:29 PM.
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